Question Detail

PHY 102 Electromagnetic Induction 2 Objective Question
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Question

How do eddy currents affect the operation of a transformer's iron core?
Options
A They increase the magnetic flux, thereby increasing efficiency.
B They act to strengthen the flux created by the primary coil, requiring less current.
C They weaken the flux created by the primary coil, leading to fatter hysteresis curves.
Correct Answer
D They have no significant effect on the magnetic flux or hysteresis curves.
Correct Answer

Option C is the correct answer.

Detailed Explanation

Page 29 explains: 'Furthermore, the eddy currents flow in a direction which, by Lenz's law, acts to weaken the flux created by the primary coil. Consequently, the current in the primary coil required to produce a given B field is increased, so the hysteresis curves are fatter along the H axis.'

Hint

Recall that eddy currents oppose the change that produces them.

Question Info

Course: PHY 102
Topic: Electromagnetic Induction 2
Type: Objective
Difficulty: Not specified
Question 764 of 1819
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